MULTIVARIATE 3-WAY DATA-ANALYSIS OF AMINO-ACID PATTERNS OF LAKES

Time dependent patterns of amino acid concentrations have been studied by HPLC for different lakes of the Berlin area, Data analysis has bee n performed by conventional principal component analysis as well as by its more recent N-way extension. It turns out that lakes mainly diffe r by their general amino acid production as a function of time and sea son, Apart from this, in a single case there occurs a specific pattern which might be related to an exterior influence, This pattern, althou gh clearly detected, has been not stable over time, Measurements are r eproducible with respect to time (comparison of two succeeding years) and to position (comparison of isolated parts of a lake).